Spark-arrester



W. B. NUTTING.

SPARK ARRESTER.

APPLICATION man JAN. 8. 1920.

Patented Jan. 4,1921.

luwwl ow 1/ Vw MOI/"M10 WILLIAM BUGKRIDGE NUTTING, OF PORTLAND, OREGON.

SPARK-ARRESTER.

Specification of Letters Patent.

Patented Jan. 4, 1921.

Application filed January 8, 1920. Serial No. 350,104.

To all whom it may concern:

Beit known that I, WILLIAM B. NUTTING, a citizen of the United States,residing at Portland, in the county of Multnomah and State of Oregon,have invented certain new and useful Improvements in Spark-Arresters;and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to improvements in spark arresters, and it hasfor its primary object to provide a device which may be easily attachedto the smoke-stack of a furnace or the like, which will prevent thesparks and hot cinders from escaping from the smoke-stack, thuspreventing fires which might otherwise occur due to sparks flying fromthe smoke-stack.

Another object of the invention is to provide a device of theabove-mentioned character which is simple in construction, as well aseiiicient and reliable in operation, one which is strong, durable,inexpensive to manufacture, and which is of such construction andarrangement of parts that it may be easily secured to a conventionaltype of smoke-stack and will not necessitate any structural changeswhatsoever of the latter.

Other objects and advantages of the invention may become apparent duringthe course of the following description.

In the accompanying drawings forming a part of this specification and inwhich like numerals are employed to designate like parts throughout thesame,

Figure 1 represents a vertical section of a device constructed inaccordance with my invention.

Fig. 2 is a top plan view thereof.

Fig. 3 is a transverse section on the plane of the line 33 of Fig. 1.

Fig. 4 is an enlarged detail perspective view of the baiiie-plate.

In the drawings, wherein for the purpose of illustration, is shown apreferred embodiment of my invention, the numeral 1 designates acylindrical pipe which is adapted to be connected to the smoke-stack ofa furnace or the like. Rising from the upper end of the smoke-stack isan enlarged inverted frusto-conical member 2. As is usual, this member 2is provided at its upper end with a flange 3 by means of which a hoodmay be bolted or otherwise secured if desired.

Disposed within the member 2 are upper and lower spaced cones 4 and 5against which the sparks and hot cinders strike and are broken up intotiny harmless particles, after which some of them pass out with thesmoke while others are deflected laterally and downward against theinner walls of the member 2 and are returned to the smokestack anddirected back to the furnace. The cones are of different sizes and thelower cone 5 is truncated so as to permit free passage of the sparks andcinders therethrough. The diameter of the base of the lower cone 5 isapproximately the same as that of the pipe; and the diameter of the baseof the upper cone 4 is of a greater diameter than that of the pipe 1, soas to insure that the sparks will be effectively caught beneath thesecones and broken up. These cones may be supported and positioneddirectly in a line with the pipe 1 by any suitable means. However, Iemploy a plurality of angle irons 6 which are secured at one of theirends to the member 2, and at their opposite ends to the cones 4 and 5.Ordinarily the sparks passing upwardly against the upper cone 4 arecaught in the apex thereof which forms a pocket, andin this way thiscone becomes intensely heated and does not last long. In order toprevent these circumstances, I provide a substantially circularbaffle-plate 7 which is carried by the cone 4, being disposedhorizontally beneath the apex of said cone in such a manner that thesparks and hot cinders, instead of coming into direct contact with theapex of the cone, come in contact with the baffle-plate 7, thus savingthe cone and causing it to last a great deal longer than it wouldotherwise. As before stated, this baflie-plate 7 is substantiallycircular in configuration and the diameter thereof is equal toapproximately the diameter of the upper open end of the lower cone 5.This halide-plate may be secured to the cone 4 in any suitable manner,but I prefer, for the sake of cheapness, to provide it with aperturedlegs or ears 8 by means of which it may be securely heldin position onthe cone 4:. The legs 8 will preferably be made integral with the bodyof the plate as shown. Particular emphasis is laid on the fact that byemploying the bafiie-plate and positioning it in the manner above setforth, the sparks issuing from the pipe will be prevented from cominginto direct contact with the apex of the upper cone l and the life ofthis cone will be greatly increased.

In operation, the smoke containing the sparks and hot cinders is forcedupwardly through the pipe 1 by a draft in the usual manner, and afterpassing out of the open end of the pipe it will pass through thetruncated cone 5 and into contact With the battle-plate 7 and lowerportion of the cone The sparks and cinders Will come into contact withthese parts with considerable force and will be broken into smallharmless particles, after which some of these particles Will be carriedout into the atmosphere by the smoke, While others will be deflected, bymeans of braille-plate 7, laterally and downward against the innersurface of the member 2, and will roll by gravity downard through thepipe 1 back to the furnace.

From the foregoing description taken in connection with the accompanyingdrawings, the operation of the device is thought to be clearlyunderstood.

A device contracted in accordance with ey invention wi l be found to beexceedingly simple in construction, very easy to apply to a smoke stack,and it will be found eifective in operation, and the particularconstruction and arrangement of parts is' such that the long life of thedevice is assured, and the parts may be easily and readily replaced andrepaired.

lVhile I have shown and described my spark arrester as being used inconnection with metal smoke-stacks, I desire it to be understood that itmay also be applied to brick chimneys or any other types of pipes orsmoke-stacks.

I claim:

A spark arrester comprising a cylindrical pipe, an enlarged invertedfrusto-conical member rising from the upper end of said pipe, being openat its upper end, a truncated cone-shaped deflector supported in the memher at a. point intermediate the upper end of the member and the pointof connection of the latter with the pipe, the base of said deflectorbeing of a diameter equal to that of the pipe, a second conicaldeflector arranged in the member near the upper end of the latter, itsapex extending above said upper end, its base being of a greater diameter than the pipe, and a baffle plate disposed horizontally beneath theapex of the upper cone, the diameter of said balile-plate beingapproximately equal to the diameter of the upper open end of thetruncated cone.

In testimony whereof I have hereunto set my hand.

WILLIAM BUCKRIDGE NUTTKNG.

